指出下来程序运行的结果是

public class Example {

 String str=new String("good");

 char[] ch = {'a','b','c'};

 public static void main(String[] args) {

  Example ex = new Example(); 

  ex.change(ex.str, ex.ch);

  System.out.println(ex.str+" and");

  System.out.println(ex.ch);

 }

 public void change(String str,char ch[]){

  str = "test ok";

  ch[0]='g';

 }

}

• A.good and abc

• B.good and gbc

• C.tst ok and abc

• D.tst ok and gbc